JOSEPH KRAFKA, JE. 



441 



No. of deiij5 at i5' 

 1 z 3 4 5 



6 7 8 



Control 



- 



U 

 L 



Fig. 13. Effect on the range of facet counts in Ultra-bar as a result of sub- 

 jecting successive cultures from the same parents for varying periods to 15° 

 before subsequent development at 27° (see Table XVII). U. is the upper range 

 of 27° stock counts; L., the lower range of 15° stock counts. 



No. of ddljS dX 15° 

 6 7 8 9 10 



11 12 



U 

 L. 



Fig. 14. Duration of the effective period at 15°. Effect on the range of facet 

 counts as a result of subjecting successive cultures from the same parentage for 

 varying periods of time to 15° before subsequent development at 27° (see 

 Table XVIII). U. is the upper range of 27° stock counts; L., the lower range 

 of 15° stock counts. 



